Process of obtaining the tin from waste tinned metal.



G. VON DER LINDE.

PEOGESS 0F OBTAINING TIN FROM WASTE TINNED METAL.

nrmo FILED mm, 1914. I 1,116,176. Patented Nov. 3, 1914,

, d "6 ad "a a UNITED s'rA'ras PATENT OFFICE.

GUSTAV vex DER LINDE; UF ST. TfiNIS; NEAL CREFELD, GERMANY.

Specification of Letters Patent.

Application filed May 6, 1914.

Patented Nov. 2?, I914.

Serial No. 836,812.

To all whom it may concern:

Be it known that I, GUsrAv VON DER LINDE, manufacturer, a subject of theGerman Emperor, residing at St. Tonis, near Crefeld, Germany, haveinvented certain new and useful Improvements in Processes of Obtainingthe Tin from Waste Tinned Metal; and I do hereby declare the followingto be a full,'clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

My invention relates to improvements in a a process of obtaining the tinfrom waste tinned metal. In recovering the tin from the tinned metal bymeans of chlorin much difiicult arises from the fact, that by theexcessive lieat produced by too strong action of the chlorin on thewaste metal the metal is burned and the output reduced. To avoid thisobjection complicated app ratus have heretofore been provided such lwlexam le as apparatus for agitating the chlorin with air, and the like.Furthermore it has been suggested to use in the process mixtures ofchlorin and air.

My invention ,is an improvement of the last named process. p

It consists in producing a thorough and uniform mixture of a suitableconcentration by means of a diffusion which is carried out in a specialway, and thereafter causing the same to act on the waste tinned sheetiron. The diffusion is carried out in such a way, that the chlorin ispassed into a chamber which is located before the reaction chamber andcommunicates therewith, and which is char ed with distributing bodiesfilled with air or increasing the surface, such for ex: ample asGuttmanns hollow balls. The chlorin gas which enters into the saidchamber flows rapidly around the air containing distributing bodies, sothat by reason of the a low molecular weight of the air the air diffusesvigorousl into the vapor of chlorin so as to dilute the same. Themixture of air and chlorin which is thus obtained is uniformlydistributed over the sheet metal for removing the tin therefrom,=a-ndwhich is located in the form of packages within an 'operi receptaclehaving a sulfuric acid seal.

By the reduction of pressure caused by the receptacle a.

.2. The herein described formation of tin chlorid air is drawn inthrough the sulfuric acid seal from the surrounding atmosphere. If theliquid seal is not directly connected to the reaction chamber, but tothe chamber containing the distributing bodies, the air which has beendrawn in wil at once refill thedistributing bodies, so that the processis repeated when chlorin is again admitted.

By the improved process a gaseous mixture is produced which is suitablefor uniformly and completely removing the tin, and which prevents theWaste metal from being burned.

The drying, chlorinating, and washing can be.carried out within the samereceptacle and without pressure.

In order that my improved process be more clearly understood anapparatus which is suitable for carrying the same is shown in theaccompanying drawing, which shows a longitudinal section of the aparatus.

In the example shown in t lie drawing, the reaction is performed withina receptacle a which is charged with the waste tinned sheet iron, andwhich communicates with a chamber d through holes-made in the wall ofthe The chamber d is connected with supply pipes b for the chlorin andwith a pipe 0 which is connected with'the sulfuric acid seal. Thechamber (Z is charged with air filled distributing bodies, such forexample as Guttmanns hollow balls f. The chlorin is intermittentlysupplied through the pipes b from a suitable source, is mixed with theair of the distributing bodies so as to form a mixture of chlorin andair, and is finally admitted to" the reaction chamber a. When thepressure within the latter is reduced by the reaction, air is drawn intothe chamber 03 through the pipe 0, so that the distributing bodies areagain filled with air.

I claim herein as my invention:

1. Theherein described process of removing tin from tinned metals, whichconsists in producing a thorough and uniform mixture of air and chlorinby diffusion, and causing such mixture to act on the tinned metals.

rocess of removing tin from tinned meta s, which consists in supplyingchlorin to'a chamber which is charged with air containing distributingbodies whereby the air is mixed with chlorin chlorin in properproportions, and causing by diffusion, and supplying the mixture of suchmixture to act on the tinned metals. l0 chlorin and air which is thusobtained to a In testimony whereof I afixed my signareaction chambercontaining the tinned ture, in presence of two Witnesses.

5 metal. 1 GUST VON DER LINDE.

3. The process of removingtin fromtinned Witnesses: metals, Whichconsists 'in effecting a thor- NOEL STEVENSON, ough and uniform mixtureof air and PAUL Drums. I

